Pro-Seal™ PS 870 Class B-1/2 Corrosion Inhibiting Sealant (Semkit Injection Kit)

Fast-curing, manganese dioxide-cured polysulfide sealant containing soluble chromate corrosion inhibitors, packaged in a Semkit injection kit.

Pack Size	Price / Unit	Stock	Shelf Life	Batch No	Color
Base Unit	***	Limited Stock — 100 Available	30 Sep 2026	—	—

• Pro-Seal™ PS 870 Class B-1/2 is a two-part, synthetic rubber compound designed as a high-performance sealant for faying surfaces, sealing joints, and sealing airframe components against moisture and aviation fuels.
• Infused with active corrosion inhibitors, it provides an outstanding barrier against galvanic and environmental corrosion, especially in high-salt marine environments.
• Formulated as a thixotropic paste, it has a 30-minute application life and mixes cleanly inside a specialized Semkit (injection cartridge) to ensure exact ratios for critical repair operations.

Material	Two-component manganese dioxide-cured polysulfide liquid polymer containing active chromate corrosion inhibitors.
Finish / Coating	Cures at room temperature to a tough, resilient synthetic rubber paste with a Dark Grey color profile.
Dimensions	Standard multi-component cartridge configuration tailored for pneumatic or manual aerospace extrusion guns.
Weight	~0.45 Pounds (Standard 6 oz cartridge container with a 2.5 oz or 3.5 oz net fluid fill volume).
Operating Temperature Range	Maintainable flexibility and performance across a service window of -54°C to 121°C (-65°F to 250°F), with intermittent brief exposure spikes reaching up to 135°C (275°F).
Standard / Grade	• Class B-1/2 (Thick paste formula with a 30-minute application/work life).

US Military	Fully qualified to MIL-PRF-81733D Type II-1/2 Class 1 Grade A (and SAE AMS 3265 alternatives).
Boeing	Qualified to BMS 5-95 and BMS 3-23 parameters.
Airbus	Meets standard multi-platform Consumable Material List (CML) guidelines for corrosion-inhibiting structure sealants.
Lockheed Martin	Certified under MIL-S-81733 for structural weapon system moisture sealing.
FAA	Extensively approved via localized structural repair manuals (SRM) and aircraft component maintenance logs handling critical faying surfaces.